The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 2016
Filed:
Mar. 25, 2011
Akinari Takada, Tokyo, JP;
Takuji Ike, Tokyo, JP;
Akinari Takada, Tokyo, JP;
Takuji Ike, Tokyo, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
CITIZEN WATCH CO., LTD., Tokyo, JP;
Abstract
A radio-controlled timepiece includes an oscillator circuit of which an oscillation condition can be varied by an oscillation condition adjustment circuit that adjusts an oscillation frequency, a frequency divider circuit that divides the oscillation frequency and generates a time measurement reference timing signal, a frequency adjustment circuit that adjusts the period of time measurement reference timing signal, a local oscillator circuit that uses the oscillation frequency as a reference frequency and outputs a local oscillation frequency, and a control circuit. The control circuit, when the radio-controlled timepiece is performing reception operations, causes the oscillation condition adjustment circuit to operate whereby the oscillation frequency is adjust to an optimal frequency for the local oscillator circuit and the variation setting value of the frequency adjustment circuit is set such that time measurement reference timing signal has a fixed period for normal operations and for reception operations.